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Derivatives and Hedging Activities - Schedule of Derivative Instruments Not Designated as Cash Flow Hedges (Detail) (Foreign Exchange Forward Contracts, USD $)
In Millions, unless otherwise specified
12 Months Ended
Apr. 26, 2013
Apr. 27, 2012
Apr. 29, 2011
Foreign Exchange Forward Contracts
     
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized into Income $ 6.5 $ 21.0 $ (20.6)